1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 697c6bf248c2..3b09444121d9 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -199,6 +199,10 @@ struct vm_operations_struct {
         void (*close)(struct vm_area_struct * area);
         struct page * (*nopage)(struct vm_area_struct * area, unsigned long address, int *type);
         int (*populate)(struct vm_area_struct * area, unsigned long address, unsigned long len, pgprot_t prot, unsigned long pgoff, int nonblock);
+
+        /* notification that a previously read-only page is about to become
+         * writable, if an error is returned it will cause a SIGBUS */
+        int (*page_mkwrite)(struct vm_area_struct *vma, struct page *page);
 #ifdef CONFIG_NUMA
         int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new);
         struct mempolicy *(*get_policy)(struct vm_area_struct *vma,